Nine adults and two children were forced from their homes when flames tore through a multi-family house on Bouton Street in South Norwalk on Wednesday night.
Police and fire crews were called to 8 Bouton Street around 6:30 p.m. and arrived to find fire tearing through the front of the house. Firefighters said flames coming from a first-floor window crawled up the front of the building.
Fire crews doused the flames with water from two hose lines and had the blaze under control within 23 minutes of arriving on scene, according to the fire department.
Twenty-three firefighters responded to the blaze, and Norwalk police helped with crowd and traffic control.
No one was hurt, but the house has been deemed unlivable and the Red Cross has been called in to help the two displaced families, firefighter said.
The Norwalk fire marshal's office is investigating to determine the cause of the fire.